It will be a similar story in parts of Quebec with humidex values expected to exceed 40 this week.

According to Environment Canada, a very humid air mass covering the region over the next few days will make conditions extremely uncomfortable.

"Overnight lows will also remain around the 20-degree mark, making for uncomfortable nights," Environment Canada warns.

This type of heat and humidity can be dangerous, especially for people who suffer from a chronic disease (eg, respiratory ailments or heart disease), people suffering from mental health problems and children four years of age and under.

Exposure to these conditions could also cause discomfort, such as muscle cramps, exhaustion and heatstroke.